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A	B	C	D	E	F
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Y	Z

H-DL-Ser(Me)-OH

Acetyl-L-Threonine

Boc-L-Threonine methyl ester

Boc-O-benzyl-L-threonineN-hydroxysuccinimideester

Boc-O-methyl-L-threonine

Z-O-tert.butyl-L-threoninedicyclohexylamine salt

Z-O-tert.butyl-L-threonine tert.butyl ester

O-Methyl-L-threonine

O-tert.Butyl-D-threonine

DL-Threonine methyl ester hydrochloride